WO2017118030A1

WO2017118030A1 - Optical fingerprint sensor module

Info

Publication number: WO2017118030A1
Application number: PCT/CN2016/095848
Authority: WO
Inventors: 凌严; 朱虹; 那志成
Original assignee: 上海箩箕技术有限公司
Priority date: 2016-01-07
Filing date: 2016-08-18
Publication date: 2017-07-13
Also published as: US10546175B2; US20180121701A1; CN106951817A

Abstract

An optical fingerprint sensor module comprises: an optical fingerprint sensor (320), the optical fingerprint sensor (320) having a light transmitting substrate (322) and a device layer located on a surface of the light transmitting substrate (322), the device layer having a pixel area (321), the pixel area (321) having a plurality of pixels, each pixel having a light transmitting area and a non-light-transmitting area, the non-light-transmitting area having a photosensitive element, the light transmitting area enabling lights to transmit through the pixel area (321) of the device layer; a protection layer (310) located above the entire optical fingerprint sensor (320); and a backlight source (330) located right under the pixel area (321), the backlight source (330) and the optical fingerprint sensor (320) being spaced apart with an interval, an included angle formed between a light emitted from the backlight source (330) and an upper surface of the protection layer (310) being mainly a right angle or approximately a right angle. The optical fingerprint sensor module has an improved structure and enhanced performance.

Description

Optical fingerprint sensor module

This application claims the priority of the Chinese Patent Application, filed on Jan. 7, 2016, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present invention relates to the field of optical fingerprint recognition, and in particular to an optical fingerprint sensor module.

Background technique

Fingerprint imaging recognition technology is a technology that uses an optical fingerprint sensor to collect fingerprint images of the human body and then compares them with existing fingerprint imaging information in the system to determine whether it is correct or not, and thus realizes identity recognition. Due to the convenience of its use and the uniqueness of human fingerprints, fingerprint imaging recognition technology has been widely used in various fields. For example, security inspection departments such as the Public Security Bureau and the Customs, access control systems for buildings, and consumer goods such as personal computers and mobile phones. Fingerprint imaging recognition technology can be realized by various techniques such as optical imaging, capacitive imaging, and ultrasonic imaging. Relatively speaking, optical fingerprint imaging recognition technology has relatively good imaging effect and relatively low equipment cost.

As shown in FIG. 1, the existing optical fingerprint sensor module is composed of a backlight 110, an optical fingerprint sensor 120, a protective layer 130, and a casing (not shown). When the fingerprint image is acquired, the human finger 140 is placed on the protective layer 130; the outgoing light 111 of the backlight 110 (each upward arrow in FIG. 1 indicates the outgoing light 111, and all the arrows are surrounded by a dotted circle in the figure to be uniformly labeled) Through the optical fingerprint sensor 120 and the protective layer 130, the contact interface between the human finger 140 and the protective layer 130 is reflected and transmitted; the reflected light 112 (each downward arrow in FIG. 1 indicates the reflected light 112, and the figure is virtualized The coil encloses all downward arrows to be uniformly labeled) through the protective layer 130 to illuminate the optical fingerprint sensor 120; a circuit (not shown) inside the optical fingerprint sensor 120 performs photoelectric conversion and signal processing to realize fingerprint image acquisition. Due to the contact portion of the human finger 140 and the protective layer 130 The sign reflects the fingerprint characteristics of the human body, and the characteristics of the contact portion directly affect the characteristics of the reflected light 112. Therefore, the image collected by the optical fingerprint sensor 120 directly reflects the characteristics of the human body fingerprint.

For more information on optical fingerprint sensors, refer to the Chinese utility model patent with the publication number CN203405831U.

The structure of the existing optical fingerprint sensor module needs to be improved, and the performance needs to be improved.

Summary of the invention

The problem solved by the present invention is to provide an optical fingerprint sensor module to optimize the structure of the optical fingerprint sensor module and improve the performance of the optical fingerprint sensor module.

To solve the above problems, the present invention provides an optical fingerprint sensor module, and the optical fingerprint sensor module includes:

An optical fingerprint sensor having a light transmissive substrate and a device layer on a surface of the light transmissive substrate; the device layer having a pixel region, the pixel region having a plurality of pixels, each of the pixels having a light transmission a region and a non-transmissive region, the non-transmissive region having a photosensitive element, the light transmissive region enabling light to pass through the pixel region of the device layer;

a protective layer, the protective layer being located above the entire optical fingerprint sensor;

Backlight;

The backlight is located directly below the pixel area, and the backlight and the optical fingerprint sensor are spaced apart such that an angle between the light emitted by the backlight and the upper surface of the protective layer is mainly At right angles or close to a right angle (i.e., all of the light emitted by the backlight, the angle between the light that can reach the upper surface of the protective layer and the upper surface of the protective layer is mainly a right angle or a close angle).

Optionally, a first optical adhesive layer is disposed between the optical fingerprint sensor and the protective layer, and light emitted by the backlight passes through the transparent substrate, and then from the transparent region. Passing through the device layer, entering the first optical adhesive layer, and entering the protective layer from the first optical adhesive layer.

Optionally, a first optical adhesive layer is disposed between the optical fingerprint sensor and the protective layer, and light emitted by the backlight passes through the device layer from the transparent region, and then passes through the transparent layer. The substrate is further introduced into the first optical adhesive layer, and then enters the protective layer from the first optical adhesive layer.

Optionally, the backlight comprises at least one LED light, and the light of the LED light is near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light.

Optionally, the backlight comprises two or more LED lamps, and the two or more LED lamps are symmetrically distributed directly under the optical fingerprint sensor, and the light of the LED lamp is near ultraviolet Light, purple, blue, green, yellow, red, near-infrared or white.

Optionally, the light emitting surface of the LED lamp has a collecting lens in front of the light collecting lens, and the collecting lens can convert the light of the LED lamp into parallel light or near parallel light, and the light of the backlight first enters the gathering The optical lens is re-entered into the optical fingerprint sensor.

Optionally, the surface of the optical fingerprint sensor adjacent to the backlight further includes a light anti-reflection layer capable of increasing a ratio of light of the backlight into the optical fingerprint sensor.

Optionally, a light transmissive medium layer is further included between the optical fingerprint sensor and the backlight, and the light emitted by the backlight enters the transparent medium layer first, and then enters the optical fingerprint sensor.

Optionally, a lower surface of the transparent medium layer is used as a condensing surface, and light emitted by the backlight enters the transparent medium layer from the condensing surface, and the condensing surface will be the backlight The emitted light is converted into parallel or near-parallel light.

Optionally, a second optical adhesive layer is disposed between the optical fingerprint sensor and the transparent medium layer, and light emitted by the backlight first enters the second light from the transparent medium layer. The glue layer is learned and then enters the optical fingerprint sensor from the second optical glue layer.

Optionally, the lower surface of the transparent medium layer further has a light antireflection layer, and the light antireflection layer can increase the proportion of the light of the backlight into the transparent medium layer.

Optionally, the transparent medium layer is a glass layer, a plastic layer or an optical glue layer.

Optionally, the transparent medium layer has a refractive index of 1.2 or more.

Optionally, the concentrating surface of the transparent medium layer is a sloped surface, a spherical crown surface, an ellipsoidal crown surface, a conical side surface or a pyramid side surface.

Optionally, the protective layer is a single layer or a multi-layer structure, and at least one of an upper surface, a lower surface of the protective layer and an upper surface of the optical fingerprint sensor has a filter layer.

Optionally, the device layer region further has a plurality of first axially arranged scan lines and a second axially arranged plurality of data lines, wherein the scan lines and the data lines define a plurality of grids The pixel is located in the grid.

Optionally, the first optical adhesive layer is a thermal optical adhesive layer, a photosensitive optical adhesive layer or an optical double-sided adhesive tape.

Optionally, the second optical adhesive layer is a thermal optical adhesive layer, a photosensitive optical adhesive layer or a double-sided optical tape.

Compared with the prior art, the technical solution of the present invention has the following advantages:

In the technical solution of the present invention, a new optical fingerprint sensor module is provided, and the optical fingerprint sensor module includes an optical fingerprint sensor, a protective layer and a backlight. The optical fingerprint sensor has a light transmissive substrate and a device layer on a surface of the light transmissive substrate, the device layer has a pixel region, the pixel region has a plurality of pixels, each of the pixels has a light transmissive region and is non-transparent a light region, the non-transmissive region having a light-receiving region that allows light to pass through the pixel region of the device layer. The protective layer is located above the optical fingerprint sensor. The backlight is located directly below the pixel area, and the backlight and the optical fingerprint sensor have a space therebetween, and an angle between the light emitted by the backlight and the upper surface of the protective layer is mainly a right angle Or close to a right angle. Due to the backlight Provided directly under the pixel area, and there is a gap between the backlight and the optical fingerprint sensor, so the light emitted by the backlight will pass through the optical fingerprint sensor first, then reach the protective layer, and the corresponding light and the protective layer The angle formed by the surface is mainly at right angles or close to right angles. At this time, the light reaching the upper surface of the protective layer is reflected at the interface between the upper surface of the protective layer and the fingerprint of the finger, and the most effective reflected light can be effectively reflected into the pixel in the pixel area which is closer to the corresponding reflection point, thereby improving Fingerprint recognition clarity. Therefore, the entire optical fingerprint sensor module can realize fingerprint image recognition and form a clear fingerprint image without omitting a light guide plate, which simplifies the structure of the optical fingerprint sensor module and reduces the cost.

Further, the backlight can include two LED lights. In the fingerprint image acquisition, the light of any one of the LED lights can be selected as the imaging light of the fingerprint image, and the two sets of light emitted by the two LED lights can be used for imaging, and then the noise reduction and compensation calculations are performed. A fingerprint image with higher definition and accuracy is obtained, which further improves the performance of the optical fingerprint sensor module.

Further, the surface of the optical fingerprint sensor near the backlight may further include a light anti-reflection layer, and the light anti-reflection layer can increase the proportion of the light of the backlight into the optical fingerprint sensor. Therefore, when the fingerprint image is captured, more light can be used. The fingerprint image is collected to obtain a fingerprint image with higher definition and accuracy, which further improves the performance of the optical fingerprint sensor module.

Further, a concentrating lens is disposed in front of the light emitting surface of the backlight, and the concentrating lens can convert the light of the backlight into parallel light or near parallel light, and the light of the backlight first enters the condensing lens and then enters the optical fingerprint sensor. In the fingerprint image acquisition, the fingerprint image can be collected by using parallel rays or near parallel rays, thereby obtaining a fingerprint image with smaller distortion and higher accuracy, and further improving the performance of the optical fingerprint sensor module.

Further, a transparent dielectric layer is further included between the optical fingerprint sensor and the backlight. By increasing the light-transmissive medium layer having a refractive index greater than that of air, and allowing light to enter the light-transmitting medium layer from the lower surface of the light-transmitting medium layer, the lower surface of the light-transmitting medium layer can be formed into a light-converging surface, and the light is collected. The surface can convert the light of the backlight into parallel light or near-parallel light, and the light of the backlight first enters the transparent medium layer through the concentrating surface, and then enters the optical fingerprint sensor, so that parallel light can be utilized in fingerprint image acquisition. Or near-parallel rays are used to collect fingerprint images, thereby obtaining fingerprint images with smaller distortion and higher accuracy, and further improving the performance of the optical fingerprint sensor module.

Further, the lower surface of the transparent medium layer may further include a light anti-reflection layer, which can increase the proportion of the light of the backlight into the transparent medium layer, and therefore, can use more light when performing fingerprint image acquisition. The fingerprint image is collected to obtain a fingerprint image with higher definition and accuracy, which further improves the performance of the optical fingerprint sensor module.

DRAWINGS

1 is a schematic structural view of a conventional optical fingerprint sensor module;

2 is a top plan view of a conventional optical fingerprint sensor;

3 is a cross-sectional view of the optical fingerprint sensor of FIG. 2 taken along line A-A of FIG. 2;

4 is an enlarged schematic view showing a structure surrounded by a broken line frame 220A in the optical fingerprint sensor shown in FIG. 2;

5 is a cross-sectional view showing the optical fingerprint sensor module of the optical fingerprint sensor module shown in FIG. 4 taken along the line B-B of FIG. 4;

6 is a top plan view of an optical fingerprint sensor and a backlight in an optical fingerprint sensor module according to a first embodiment of the present invention;

7 is a cross-sectional structural view of an optical fingerprint sensor module according to a first embodiment of the present invention;

8 is a cross-sectional structural view of an optical fingerprint sensor module according to a second embodiment of the present invention;

9 is a cross-sectional structural view of an optical fingerprint sensor module according to a third embodiment of the present invention;

10 is a cross-sectional structural view of an optical fingerprint sensor module according to a fourth embodiment of the present invention;

11 is a cross-sectional structural view of an optical fingerprint sensor module according to a fifth embodiment of the present invention;

12 is a cross-sectional structural view of an optical fingerprint sensor module according to a sixth embodiment of the present invention;

FIG. 13 is a cross-sectional structural diagram of an optical fingerprint sensor module according to a seventh embodiment of the present invention.

detailed description

In the existing optical fingerprint sensor, the structure shown in FIG. 2 and FIG. 3 is adopted, wherein FIG. 2 is a top view of the optical fingerprint sensor, and FIG. 3 is a cross-sectional view of the optical fingerprint sensor shown in FIG. Schematic diagram of the section. The optical fingerprint sensor includes a glass substrate 220, and a pixel array region 231 and a peripheral circuit on the glass substrate 220. The peripheral circuit area includes a drive circuit 234, a signal readout chip 232, and a flexible printed circuit board 233. Pixel array region 231 includes an array of pixels for receiving, converting, and temporarily storing optical signals. The peripheral circuit area further includes a flexible printed circuit board bonding area 233A, a connection line between the pixel array area 231, the binding area of the signal sensing chip 232, and the binding area of the flexible printed circuit board 233 (each connecting line is Not shown in Figure 3).

Fig. 4 is an enlarged schematic view showing a portion surrounded by a broken line frame 220A in the optical fingerprint sensor shown in Fig. 2. As shown in FIG. 4, the pixel array region 231 includes a plurality of pixels (not labeled) arranged in a matrix array, the rows and columns of the pixels being composed of a plurality of first axial scan lines 2311 and a plurality of second axes. It is defined by the data line 2312. Each of the pixels includes a signal control switch 2313 and a photoelectric conversion unit 2314, and the pixel further includes a light transmitting region (not labeled in FIG. 4), the light transmitting region is transparent to light, and the corresponding backlight can pass The light transmissive area passes through the optical fingerprint sensor. The scan line 2311 is connected to the drive circuit 234. The data line 2312 is connected to the binding area of the signal readout chip 232.

FIG. 5 is a schematic cross-sectional view showing a conventional optical fingerprint sensor module having the above optical fingerprint sensor. The cross-sectional position of FIG. 5 is the position along the BB dotted line in the structure shown in FIG. 4, and the BB dotted line passes through the pixel P1 in FIG. And pixel P2. As shown in FIG. 5, the optical fingerprint sensor module includes a backlight 200, a light guide plate 210, an optical fingerprint sensor (not labeled), a glue layer 240, and a protective layer 250. The optical fingerprint sensor has a transparent substrate 220 and is transparent. The device layer 230 on the surface of the light substrate 220, FIG. 5 shows that both the pixel P1 and the pixel P2 have a non-transmissive region 2301 and a light-transmitting region 2302.

In the existing optical fingerprint sensor module, the backlight 200 is usually an LED lamp, and is disposed on one side of the light guide plate 210. The light emitted by the backlight 200 is irradiated into the light guide plate 210 within a certain divergence angle. The back of the light guide plate 210 has a hemispherical or semi-ellipsoidal type of small bumps 211. When the light inside the light guide plate 210 is irradiated to the small bumps 211, scattering occurs, thereby changing the direction of the light and achieving upward illumination. The bottom of the light guide plate 210 (below the small bumps 211) and other sides also have a reflective film (not shown in FIG. 5). When the light reaches the back surface or other side of the light guide plate 210, most of the light is returned to the light guide plate 210. Thus, the light is continuously scattered by the small bumps 211 to the upward direction.

However, since the light scattered upward by the small bumps 211 at the bottom of the light guide plate 210 has a certain angular distribution range, not only the vertical direction but also a lot of oblique upwards or even the horizontal angles upward (the light 200a in the figure) Shown). When the light 200b is irradiated to the protective layer 250 at an angle close to vertical (the vertical means that the light is perpendicular to the upper surface of the protective layer 250), after the reflective transmission is transmitted at the contact interface of the finger 260, the reflected light is also irradiated at a nearly vertical angle. To the sensor, the reflected light will illuminate the pixel below the fingerprint or nearby pixels, resulting in a clearer fingerprint image. When the light 200a deviates from the vertical angle, even when it is close to the horizontal angle, the reflected light will illuminate the pixel farther from the fingerprint. The signals of the above-mentioned light 200a and light 200b interfere with each other, and a relatively blurred fingerprint image is formed.

Since the protective layer 250 must have a corresponding thickness to achieve a certain reliability, Therefore, the above-mentioned occurrence of a relatively blurred fingerprint image or even the formation of an effective fingerprint image is almost inevitable for the existing optical fingerprint sensor module.

To this end, the present invention provides a new optical fingerprint sensor module in which a backlight is disposed directly below the pixel region, so that the light emitted by the backlight passes through the optical fingerprint sensor first (through the optical fingerprint sensor includes both The transparent substrate passes through, and also includes through the transparent substrate and the pixel region, and then reaches the protective layer, and the angle between the corresponding light and the upper surface of the protective layer is mainly a right angle or a close angle. At this time, since all the light reaching the upper surface of the protective layer is at right angles or near right angles to the upper surface of the protective layer, the light reaching the upper surface of the protective layer is usually capable of a small offset (or zero offset). Reflecting on the interface between the upper surface of the protective layer and the fingerprint of the finger, and causing most of the effective reflected light to be irradiated into the pixel in the pixel area that is closer to the corresponding reflection point. Therefore, the entire optical fingerprint sensor module does not need the light guide plate. In this case, the fingerprint image recognition can be well realized, a clear fingerprint image is formed, the structure of the optical fingerprint sensor module is simplified, and the cost is reduced.

The above described objects, features, and advantages of the present invention will be more apparent from the aspects of the invention.

The first embodiment of the present invention provides an optical fingerprint sensor module. Please refer to FIG. 6 and FIG. 7 in combination. 6 is a top view of the optical fingerprint sensor 320 and the backlight 330 in the optical fingerprint sensor module (or a schematic view of the optical fingerprint sensor module after the protective layer 310 is omitted), and FIG. 7 is the optical fingerprint. Schematic diagram of the cross-sectional structure of the sensor module. It should be noted that the cross section shown in FIG. 7 is a cross section obtained by cutting the entire optical fingerprint sensor module along the C-C dotted line shown in FIG. 6.

Referring to FIG. 6 and FIG. 7 together, the optical fingerprint sensor module includes a protective layer 310, an optical fingerprint sensor 320, and a backlight 330.

It should be noted that FIG. 7 shows that the optical fingerprint sensor 320 is a unitary structure, but in fact, it includes a plurality of parts. For example, in the top view of the optical fingerprint sensor 320 shown in FIG. 6, the optical fingerprint sensor 320 includes a transparent substrate 322. And a pixel area 321 . Specifically, as shown in FIG. 6, the optical fingerprint sensor 320 has a transparent substrate 322 and A device layer (not all shown, not shown) located on the surface of the transparent substrate 322, the device layer having a pixel region 321 .

In this embodiment, the pixel area 321 has a rectangular shape, one side of the pixel area 321 has a length E1, and the other adjacent side has a length E2, and the side length E1 and the side length E2 can be selected according to product requirements. The pixel area 321 has a plurality of pixels (the pixels are not shown in FIG. 6 , and the content related to the pixels may be combined with the corresponding contents of FIG. 4 and FIG. 5 ), and each of the pixels has a light transmitting area and a non-light transmitting area, and the non-transparent area The light transmissive region has a photosensitive element that allows light to pass through the pixel region 321 of the device layer.

It should be noted that, in the device layer, other regions located around the periphery of the pixel region 321 may also be disposed to be transparent, that is, the pixel region 321 region can transmit light due to the light transmissive region of each pixel, and the pixel region 321 is not. The area can be made into a light-transmitting structure over the entire area or part of the area on the basis of ensuring its corresponding structure and function.

It should be noted that, in FIG. 7, the pixel region 321 is marked between two long dashed lines, which represents the plane in which the cross section shown in FIG. 7 is located, and the pixel region 321 is located in the two long dashed lines of the entire optical fingerprint sensor 320. Specifically, the optical fingerprint sensor 320 may be located in each layer structure between two broken lines (as shown in FIG. 6 , the pixel region 321 is located on the transparent substrate 322 ). The area between the two broken lines below the entire optical fingerprint sensor 320 is the area directly below the pixel area 321 . In the cross-sectional schematic diagrams corresponding to other embodiments of the present specification, the labeling of the corresponding pixel regions is also performed by the above method, which will be described together.

As shown in FIG. 7, the protective layer 310 is located above the optical fingerprint sensor 320, and the backlight 330 is located directly below the pixel region 321, and there is a gap between the backlight 330 and the optical fingerprint sensor 320 (the interval is equal to that described later). The third distance D3), therefore, the angle between the light emitted by the backlight 330 (through the pixel region) and the upper surface of the protective layer 310 is mainly at a right angle or close to a right angle.

The light emitted by the backlight 330 is as indicated by the black one-way arrow in FIG. Since the backlight 330 is located directly below the pixel region 321 , in the top view of FIG. 6 , the backlight 330 is located in the pixel region 321 , and the backlight 330 is covered by the transparent substrate 322 and the pixel region 321 . The outline of the backlight 330 in 6 is indicated by a broken line. In the picture In the cross-sectional view shown in Fig. 7, the area directly below the pixel area 321 is the area between the two long broken lines, and the backlight 330 falls within this area. Therefore, in the cross section shown in FIG. 7, in the horizontal direction, the backlight 330 has a first distance D1 from the left edge of the region directly below the pixel region 321 (the first distance D1 is also shown in FIG. 6), the backlight 330 has a second distance D2 from the right edge of the region directly below the pixel region 321 (the second distance D2 is also shown in FIG. 6), and between the backlight 330 and the entire optical fingerprint sensor 320 in the vertical direction The third distance D3. Since the pixel area 321 is a part of the optical fingerprint sensor 320, the distance between the backlight 330 and the pixel area 321 is necessarily greater than or equal to the third distance D3 in the vertical direction.

As can be seen from the above, the backlight 330 is necessarily located directly below the pixel region 321 due to the presence of the first distance D1, the second distance D2, and the third distance D3. Also, the sum of the first distance D1, the second distance D2, and the width of the backlight 330 itself is always equal to the side length E1 of the pixel region 321.

In this embodiment, the backlight 330 can be in a proper position by adjusting the sizes of the first distance D1, the second distance D2, and the third distance D3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.

In this embodiment, the backlight 330 may be an LED lamp, and the light of the LED lamp may be near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light.

It should be noted that, in other embodiments, the backlight 330 includes two or more LED lamps, and two or more LED lamps may be symmetrically and evenly distributed directly under the optical fingerprint sensor 320, each LED lamp ( The emitted light can be near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light. When the backlight 330 includes two or more LED lights, the light of each LED light may be the same or different, and the light of some LED lights may be the same, and the light of some LED lights is different.

Although not shown in the figure, in the embodiment, the optical fingerprint sensor 320 and the protective layer 310 may have a first optical adhesive layer, and the device layer is located on the transparent substrate 322 and Between the protective layer 310 (the first optical adhesive is located between the device layer and the protective layer 310), the light emitted by the backlight 330 first passes through the transparent substrate 322, and then passes through the device layer from the transparent region, and then enters the first An optical adhesive layer enters the protective layer 310 from the first optical adhesive layer.

It should be noted that, in other embodiments, the optical fingerprint sensor 320 and the protective layer 310 may also have a first optical adhesive layer, but the transparent substrate 322 is located between the device layer and the protective layer 310. An optical adhesive is disposed between the transparent substrate 322 and the protective layer 310. The light emitted by the backlight 330 passes through the device layer from the light transmitting region, then passes through the transparent substrate 322, and then enters the first optical adhesive layer. The first optical adhesive layer enters the protective layer 310.

It should be noted that the first optical adhesive layer may be a thermal optical adhesive layer, a photosensitive optical adhesive layer or an optical double-sided adhesive tape.

It should be noted that the device layer region may further have a plurality of first scan lines and a plurality of second axially arranged data lines, and the scan lines and the data lines define a plurality of grids. The pixels are located in the grid, and this part of the content can be combined with the corresponding contents of FIG. 4 and FIG.

In this embodiment, the protective layer 310 is a single layer. It should be noted that, in other embodiments, the protective layer 310 may also be a multi-layer structure, and at least one of the upper surface, the lower surface of the protective layer 310, and the upper surface of the optical fingerprint sensor has a filter layer.

In the optical fingerprint sensor module provided in this embodiment, the backlight 330 is disposed directly under the pixel region 321 , so that the light emitted by the backlight 330 passes through the optical fingerprint sensor 320 first (through the optical fingerprint sensor 320 ). Both the light transmissive substrate 322 and the light transmissive substrate 322 and the pixel region 321 are passed through, and then the protective layer 310 is reached, and the light passing through the pixel region 321 and the upper surface of the protective layer 310 are The angle formed is mainly at right angles or close to right angles. At this time, since all the light rays reaching the upper surface of the protective layer 310 are at right angles or near right angles to the upper surface of the protective layer 310 (especially the light passing through the optical fingerprint sensor 320 from the pixel region 321 , they are more likely to interact with the protective layer 310 The upper surface is at right angles or near right angles. Therefore, the light reaching the upper surface of the protective layer 310 is usually able to be on the upper surface of the protective layer with a small offset (or zero offset). The interface with the finger fingerprint is reflected, and most of the effective reflected light is irradiated into the pixel in the pixel area 321 which is closer to the corresponding reflection point. Therefore, the entire optical fingerprint sensor module can be used without the light guide plate. The fingerprint image is recognized to form a clear fingerprint image, which simplifies the structure of the optical fingerprint sensor module and reduces the cost.

A second embodiment of the present invention provides another optical fingerprint sensor module. Please refer to FIG. 8. FIG. 8 is a cross-sectional structural diagram of the optical fingerprint sensor module. The optical fingerprint sensor module includes a protective layer 410 and an optical fingerprint. Sensor 420 and backlight. For the protective layer 410 and the optical fingerprint sensor 420, reference may be made to the corresponding contents of the protective layer 310 and the optical fingerprint sensor 320 in the foregoing embodiments. Other unmentioned structures and contents of the optical fingerprint sensor module of this embodiment may also refer to the foregoing content of the present specification.

In the same embodiment as the foregoing embodiment, the backlight is located directly below the pixel area 421, and there is a gap between the backlight and the optical fingerprint sensor 420 (the intervals are respectively equal to the third distance F3 and the sixth described later). The distance F6), therefore, the angle between the light emitted by the backlight and the upper surface of the protective layer 410 is mainly at a right angle or close to a right angle. However, unlike the foregoing embodiment, as shown in FIG. 8, in the embodiment, the backlight includes two LED lamps, which are an LED lamp 430 and an LED lamp 440, respectively. The light emitted by the LED lamp 430 and the LED lamp 440 is as shown by the black one-way arrow in FIG. The LED lamp 430 and the LED lamp 440 are located directly below the pixel region 421. In the top plan view shown in FIG. 8, the LED lamp 430 is located on the left side of the LED lamp 440. In the cross-sectional view shown in Fig. 8, the area directly under the pixel area 421 is the area between the two long broken lines, and the LED lamp 430 and the LED lamp 440 fall within this area.

Therefore, in the cross section shown in FIG. 8, in the horizontal direction, the LED lamp 430 has a first distance F1 between the left edge of the region directly below the pixel region 421, and the right edge of the region below the LED lamp 430 and the pixel region 421. There is a second distance F2 between them. In the vertical direction, the LED lamp 430 has a third distance F3 from the entire optical fingerprint sensor 420. Since the pixel area 421 is a part of the optical fingerprint sensor 420, the distance between the LED lamp 430 and the pixel area 421 is necessarily greater than or equal to the third distance F3 in the vertical direction.

As can be seen from the above, the LED lamp 430 is necessarily located directly below the pixel region 421 due to the presence of the first distance F1, the second distance F2, and the third distance F3. The sum of the first distance F1, the second distance F2, and the width of the LED lamp 430 itself is always equal to one of the side lengths of the pixel region 421 (refer to the side length E1 in FIG. 6). In this embodiment, the LED light 430 can be placed in an appropriate position by adjusting the sizes of the first distance F1, the second distance F2, and the third distance F3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.

Similarly, in the cross section shown in FIG. 8, in the horizontal direction, the LED lamp 440 has a fourth distance F4 between the left edge of the region directly below the pixel region 421, and the right side of the region below the LED lamp 440 and the pixel region 421. There is a fifth distance F5 between the edges. In the vertical direction, the LED light 440 has a sixth distance F6 from the entire optical fingerprint sensor 420. Since the pixel area 421 is a part of the optical fingerprint sensor 420, the distance between the LED lamp 440 and the pixel area 421 is necessarily greater than or equal to the sixth distance F6 in the vertical direction.

As can be seen from the above, the LED lamp 440 is necessarily located directly below the pixel region 421 due to the presence of the fourth distance F4, the fifth distance F5, and the sixth distance F6. The sum of the fourth distance F4, the fifth distance F5, and the width of the LED lamp 440 itself is always equal to one of the side lengths of the pixel area 421 (refer to the side length E1 in FIG. 6). In this embodiment, the LED light 440 can be placed in an appropriate position by adjusting the sizes of the fourth distance F4, the fifth distance F5, and the sixth distance F6, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.

In this embodiment, the light of the LED lamp 430 and the LED lamp 440 (issued) may be near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light. Also, the light of the two LED lights (issued) may be the same or different. It should be noted that, in other embodiments, the backlight includes three or more LED lamps, and three or more LED lamps may be symmetrically and evenly distributed directly under the optical fingerprint sensor 420. For example, when the backlight includes four LED lamps, when the shape of the pixel region 421 is rectangular, the four LED lamps may be symmetrically distributed in the rectangular pixel region 421. Directly below. In other embodiments, the light of each LED lamp may be near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light, and the light of each LED lamp may be the same. It can also be different, and the light of some LED lights can be the same, and the light of some LED lights is different.

In the optical fingerprint sensor module provided by the embodiment, the entire optical fingerprint sensor module can realize fingerprint image recognition without forming a light guide plate, and form a clear fingerprint image, which simplifies the optical fingerprint sensor module. Structure, reducing costs. Meanwhile, since the backlight includes the LED lamp 430 and the LED lamp 440, when the fingerprint image is captured, the light of any one of the LED lamps can be selected as the imaging light of the fingerprint image, and the two LED lamps can be used in turn. The group of light is imaged, and then noise reduction and compensation calculations are performed to obtain a fingerprint image with higher definition and accuracy, thereby further improving the performance of the optical fingerprint sensor module.

In other embodiments, when the backlight includes more LED lights, each group of light emitted by each LED lamp can also be taken in turn for imaging, and then noise reduction and compensation calculations are performed, thereby obtaining higher definition and accuracy. The fingerprint image further enhances the performance of the optical fingerprint sensor module.

A third embodiment of the present invention provides another optical fingerprint sensor module. Please refer to FIG. 9. FIG. 9 is a cross-sectional structural diagram of the optical fingerprint sensor module. The optical fingerprint sensor module includes a protective layer 510 and an optical fingerprint. Sensor 520 and backlight 530.

In this embodiment, the backlight 530 is located directly below the pixel area 521, and there is a gap between the backlight 530 and the optical fingerprint sensor 520 (the interval is equal to the third distance G3 described later), and the light emitted by the backlight 530 is The angle formed by the upper surface of the protective layer 510 is mainly a right angle or a close angle.

In this embodiment, the light emitted by the backlight 530 is as shown by the black one-way arrow in FIG. Since the backlight 530 is located directly below the pixel region 521, the backlight 530 is located directly below the pixel region 521 in the cross section shown in FIG. Further, in the cross-sectional view shown in Fig. 9, the area directly under the pixel area 521 is the area between the two long broken lines, and the backlight 530 falls within this area. Therefore, in the section shown in Figure 9, in the horizontal direction, The backlight 530 has a first distance G1 between the left edge of the area directly below the pixel area 521, and the second distance G2 between the backlight 530 and the right edge of the area directly below the pixel area 521. In the vertical direction, the backlight 530 has a third distance G3 from the entire optical fingerprint sensor 520. Since the pixel area 521 is a part of the optical fingerprint sensor 520, the distance between the backlight 530 and the pixel area 521 is necessarily greater than or equal to the third distance G3 in the vertical direction. And, the sum of the first distance G1, the second distance G2, and the width of the backlight 530 itself is equal to the side length of one of the sides of the pixel region 521.

As can be seen from the above, the backlight 530 is necessarily located directly below the pixel region 521 due to the presence of the first distance G1, the second distance G2, and the third distance G3. In this embodiment, the backlight 530 can be in a proper position by adjusting the sizes of the first distance G1, the second distance G2, and the third distance G3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.

Other unmentioned structures and contents of the optical fingerprint sensor module of this embodiment can be referred to the aforementioned corresponding contents of the present specification.

Different from the foregoing embodiment, as shown in FIG. 9, in this embodiment, the surface of the optical fingerprint sensor 520 adjacent to the backlight 530 further includes a light anti-reflection layer 540, which can increase the light of the backlight 530 into the optical fingerprint sensor. The ratio of 520.

In the optical fingerprint sensor module provided by the embodiment, the entire optical fingerprint sensor module can realize fingerprint image recognition without forming a light guide plate, and form a clear fingerprint image, which simplifies the optical fingerprint sensor module. Structure, reducing costs. At the same time, the surface of the optical fingerprint sensor 520 adjacent to the backlight 530 further includes a light anti-reflection layer 540, which can increase the proportion of the light of the backlight 530 entering the optical fingerprint sensor 520. Therefore, when performing fingerprint image acquisition, The use of more light for fingerprint image acquisition results in a sharper and more accurate fingerprint image, further improving the performance of the optical fingerprint sensor module.

A fourth embodiment of the present invention provides another optical fingerprint sensor module. Referring to FIG. 10, FIG. 10 is a cross-sectional structural diagram of the optical fingerprint sensor module. The optical fingerprint sensor module includes a protective layer 610 and an optical fingerprint. Sensor 620 and backlight 630.

In this embodiment, the backlight 630 is located directly below the pixel area 621, and there is a gap between the backlight 630 and the optical fingerprint sensor 620 (the interval is equal to the third distance H3 described later), and the light emitted by the backlight 630 is The angle formed by the upper surface of the protective layer 610 is mainly a right angle or a close angle.

In this embodiment, the light emitted by the backlight 630 is as shown by the black one-way arrow in FIG. Since the backlight 630 is located directly below the pixel region 621, in the cross section shown in FIG. 10, the backlight 630 is located directly below the pixel region 621. Further, in the cross-sectional view shown in FIG. 10, the area directly under the pixel area 621 is the area between the two long broken lines, and the backlight 630 falls within this area. Therefore, in the cross section shown in FIG. 10, in the horizontal direction, the backlight 630 has a first distance H1 between the left edge of the region directly below the pixel region 621, and between the backlight 630 and the right edge of the region directly below the pixel region 621. Has a second distance H2. In the vertical direction, the backlight 630 has a third distance H3 from the entire optical fingerprint sensor 620. Since the pixel area 621 is a part of the optical fingerprint sensor 620, the distance between the backlight 630 and the pixel area 621 is necessarily greater than or equal to the third distance H3 in the vertical direction. And, the sum of the first distance H1, the second distance H2, and the width of the backlight 630 itself is equal to the side length of one of the sides of the pixel region 621.

As can be seen from the above, the backlight 630 is necessarily located directly below the pixel region 621 due to the presence of the first distance H1, the second distance H2, and the third distance H3. In this embodiment, the backlight 630 can be in a proper position by adjusting the sizes of the first distance H1, the second distance H2, and the third distance H3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.

Since the exiting light of the LED lamp has a certain range of divergence angles, rather than parallel light, the incident angles of light reaching different regions of the upper surface of the protective layer are slightly different. Therefore, the pixels irradiated by the different areas of the upper surface of the protective layer are slightly different in offset distance from the corresponding reflection points, thereby causing slight image distortion. The thicker the protective layer, the absolute amount of distortion The bigger.

Different from the foregoing embodiment, as shown in FIG. 10, in the embodiment, the light-emitting surface of the backlight 630 has a collecting lens 640, and the collecting lens 640 can convert the light of the backlight 630 into parallel light or near-parallel light, and the backlight The light from source 630 first enters condenser lens 640 and enters optical fingerprint sensor 620.

In this embodiment, the condensing lens 640 is a convex lens. At this time, when the distance of the backlight from the condensing lens 640 is exactly equal to the focal length of the convex lens, the light passing through the condensing lens 640 is adjusted to be parallel light. In other embodiments, the concentrating lens 640 can also be other suitable lenses, such as Fresnel lenses.

In the optical fingerprint sensor module provided by the embodiment, the entire optical fingerprint sensor module can realize fingerprint image recognition without forming a light guide plate, and form a clear fingerprint image, which simplifies the optical fingerprint sensor module. Structure, reducing costs. At the same time, a condensing lens 640 is disposed in front of the light emitting surface of the backlight 630. The condensing lens 640 can convert the light of the backlight 630 into parallel light or near-parallel light, and the light of the backlight 630 first enters the collecting lens 640 and then enters. The optical fingerprint sensor 620 can be used to collect fingerprint images by using parallel rays or near-parallel rays during fingerprint image acquisition, thereby obtaining fingerprint images with smaller distortion and higher accuracy, and further improving the optical fingerprint sensor module. Performance.

A fifth embodiment of the present invention provides another optical fingerprint sensor module. Referring to FIG. 11, FIG. 11 is a cross-sectional structural diagram of the optical fingerprint sensor module, and the optical fingerprint sensor module includes a protective layer 710 and an optical fingerprint. The sensor 720 and the backlight, the backlight includes an LED lamp 730 and an LED lamp 740.

In this embodiment, the backlight is located directly below the pixel area 721, and there is a gap between the backlight and the optical fingerprint sensor 720 (the interval is equal to the third distance I3 and the sixth distance I6 described later), and the backlight is emitted. The angle between the light and the upper surface of the protective layer 710 is mainly a right angle or a close angle.

In this embodiment, the light emitted by the backlight is as shown by the black one-way arrow in FIG. Since the backlight is located directly below the pixel region 721, in the cross section shown in FIG. 11, the backlight is located directly below the pixel region 721. Further, in the cross-sectional view shown in Fig. 11, the area directly under the pixel area 721 is the area between the two long broken lines, and the backlight falls within this area.

In the cross section shown in Fig. 11, in the horizontal direction, the LED lamp 730 has a first distance I1 between the left edge of the region directly below the pixel region 721, and between the LED lamp 730 and the right edge of the region directly below the pixel region 721. There is a second distance I2. In the vertical direction, the LED lamp 730 has a third distance I3 from the entire optical fingerprint sensor 720. Since the pixel area 721 is a part of the optical fingerprint sensor 720, the distance between the LED lamp 730 and the pixel area 721 is necessarily greater than or equal to the third distance I3 in the vertical direction.

As can be seen from the above, the LED lamp 730 is necessarily located directly below the pixel region 721 due to the presence of the first distance I1, the second distance I2, and the third distance I3. The sum of the first distance I1, the second distance I2, and the width of the LED lamp 730 itself is always equal to one side of the pixel area 721 (refer to the side length E1 in FIG. 6). In this embodiment, the LED light 730 can be placed in an appropriate position by adjusting the sizes of the first distance I1, the second distance I2, and the third distance I3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.

Similarly, in the cross section shown in FIG. 11, in the horizontal direction, the LED lamp 740 has a fourth distance I4 between the left edge of the area directly below the pixel area 721, and the right side of the area directly below the pixel area 721 of the LED lamp 740. There is a fifth distance I5 between the edges. In the vertical direction, the LED light 740 has a sixth distance I6 from the entire optical fingerprint sensor 720. Since the pixel area 721 is a part of the optical fingerprint sensor 720, the distance between the LED lamp 740 and the pixel area 721 is necessarily greater than or equal to the sixth distance I6 in the vertical direction.

As can be seen from the above, the LED lamp 740 is necessarily located directly below the pixel region 721 due to the presence of the fourth distance I4, the fifth distance I5, and the sixth distance I6. The sum of the fourth distance I4, the fifth distance I5, and the width of the LED lamp 740 itself is always equal to one of the side lengths of the pixel area 721 (refer to the side length E1 in FIG. 6). In this embodiment, it can be adjusted The magnitudes of the fourth distance I4, the fifth distance I5, and the sixth distance I6 cause the LED lamp 740 to be in a proper position, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.

Different from the foregoing embodiment, as shown in FIG. 11, in this embodiment, a condensing lens 750 is disposed between the LED lamp 730 and the optical fingerprint sensor 720, and a condensing lens 760 is disposed between the LED lamp 740 and the optical fingerprint sensor 720. That is, the light-emitting surface of the LED lamp 730 has a collecting lens 750 in front of it, and the collecting lens 750 can convert the light of the LED lamp 730 into parallel light or near-parallel light, and the light of the LED lamp 730 first enters the collecting lens 750 and then enters the optical Fingerprint sensor 720. The light-emitting surface of the LED lamp 740 has a collecting lens 760. The collecting lens 760 can convert the light of the LED lamp 740 into parallel light or near-parallel light. The light of the LED lamp 740 first enters the collecting lens 760 and then enters the optical fingerprint sensor. 720.

In the optical fingerprint sensor module provided by the embodiment, the entire optical fingerprint sensor module can realize fingerprint image recognition without forming a light guide plate, and form a clear fingerprint image, which simplifies the optical fingerprint sensor module. Structure, reducing costs. At the same time, a condenser lens 750 and a collecting lens 760 are respectively disposed in front of the light emitting surface of the LED lamp 730 and the LED lamp 740, and the collecting lens 750 and the collecting lens 760 can convert the light of the LED lamp 730 and the LED lamp 740 into parallel light, respectively. Or near-parallel light, the light of the LED lamp 730 and the LED lamp 740 first enters the corresponding collecting lens, and then enters the optical fingerprint sensor 720. Therefore, when the fingerprint image is captured, the parallel light or the near parallel light can be used for the fingerprint image. The acquisition is performed to obtain a fingerprint image with smaller distortion and higher accuracy, which further improves the performance of the optical fingerprint sensor module.

A sixth embodiment of the present invention provides another optical fingerprint sensor module. Referring to FIG. 12, FIG. 12 is a cross-sectional structural diagram of the optical fingerprint sensor module. The optical fingerprint sensor module includes a protective layer 810 and an optical fingerprint. Sensor 820 and backlight 830.

In this embodiment, the backlight 830 is located directly below the pixel area 821, and there is a gap between the backlight 830 and the optical fingerprint sensor 820 (the interval is equal to the third part described later) Distance J3), the angle between the light emitted by the backlight 830 and the upper surface of the protective layer 810 is mainly a right angle or a close angle.

In this embodiment, the light emitted by the backlight 830 is as shown by the black one-way arrow in FIG. Since the backlight 830 is located directly below the pixel region 821, in the cross section shown in FIG. 12, the backlight 830 is located directly below the pixel region 821. Further, in the cross-sectional view shown in Fig. 12, the area directly under the pixel area 821 is the area between the two long broken lines, and the backlight 830 falls within this area. Therefore, in the cross section shown in FIG. 12, in the horizontal direction, the backlight 830 has a first distance J1 between the left edge of the region directly below the pixel region 821, and the backlight 830 and the pixel region 821 are directly below. There is a second distance J2 between the right edges of the area; and a third distance J3 between the backlight 830 and the entire optical fingerprint sensor 820 in the vertical direction. Since the pixel area 821 is a part of the optical fingerprint sensor 820, the distance between the backlight 830 and the pixel area 821 is necessarily greater than or equal to the third distance J3 in the vertical direction.

As can be seen from the above, due to the presence of the first distance J1, the second distance J2, and the third distance J3, the backlight 830 must be located directly below the pixel region 821. In this embodiment, the backlight 830 can be in a proper position by adjusting the sizes of the first distance J1, the second distance J2, and the third distance J3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.

Different from the foregoing embodiment, as shown in FIG. 12, in the embodiment, the optical fingerprint sensor 820 and the backlight 830 further include a transparent medium layer 840. The light emitted by the backlight 830 first enters the transparent medium layer 840, and then Enter the optical fingerprint sensor 820. The refractive index of the transparent dielectric layer 840 is always greater than the refractive index of the air, and the lower surface of the transparent dielectric layer 840 is a concentrating surface (not labeled in FIG. 12). In this embodiment, the condensing surface of the transparent medium layer 840 can convert the light of the backlight 830 into parallel light or near-parallel light, and the light of the backlight 830 first enters the transparent medium layer 840 and then enters the optical fingerprint sensor 820. Therefore, when fingerprint image acquisition is performed, the fingerprint image can be collected by using parallel rays or near parallel rays, thereby obtaining a fingerprint image with smaller distortion and higher accuracy, and further improving the performance of the optical fingerprint sensor module.

In this embodiment, the refractive index of the transparent dielectric layer 840 can be further selected to be 1.2 or more, thereby further improving the performance of the optical fingerprint sensor module.

In this embodiment, the material of the transparent medium layer 840 may specifically be a glass layer, a plastic layer or an optical glue layer.

In this embodiment, the concentrating surface of the transparent medium layer 840 is an ellipsoidal crown surface. In other embodiments, the concentrating surface of the transparent medium layer 840 may also be a sloped surface, a spherical crown surface, a conical side surface, or a pyramid side surface.

It should be noted that although not shown in the figure, in the embodiment, a second optical adhesive layer may be disposed between the optical fingerprint sensor 820 and the transparent medium layer 840, and the light emitted by the backlight 830 is transmitted from the transparent dielectric layer. The 840 first enters the second optical adhesive layer, and then enters the optical fingerprint sensor 820 from the second optical adhesive layer. The second optical adhesive layer can prevent air from being present between the optical fingerprint sensor 820 and the transparent medium layer 840, thereby preventing light from being scattered and refracted in the air between the optical fingerprint sensor 820 and the transparent medium layer 840, thereby improving subsequent fingerprints. The quality of the image.

A seventh embodiment of the present invention provides another optical fingerprint sensor module. Referring to FIG. 13, FIG. 13 is a cross-sectional structural diagram of the optical fingerprint sensor module. The optical fingerprint sensor module includes a protective layer 910 and an optical fingerprint. Sensor 920 and backlight 930.

In this embodiment, the backlight 930 is located directly below the pixel area 921, and there is a gap between the backlight 930 and the optical fingerprint sensor 920 (the interval is equal to the third distance K3 described later), and the light emitted by the backlight 930 is The angle formed by the upper surface of the protective layer 910 is mainly a right angle or a close angle.

In this embodiment, the light emitted by the backlight 930 is as shown by the black one-way arrow in FIG. Since the backlight 930 is located directly below the pixel region 921, in the cross section shown in FIG. 13, the backlight 930 is located directly below the pixel region 921. Moreover, in the cross-sectional view shown in FIG. 13, the area directly below the pixel area 921 is between the two long dashed lines. The area, and the backlight 930 falls within this area. Therefore, in the cross section shown in FIG. 13, in the horizontal direction, the backlight 930 has a first distance K1 between the left edge of the region directly below the pixel region 921, and the backlight 930 and the pixel region 921 are directly below. There is a second distance K2 between the right edges of the area; and a third distance K3 between the backlight 930 and the entire optical fingerprint sensor 920 in the vertical direction. Since the pixel area 921 is a part of the optical fingerprint sensor 920, the distance between the backlight 930 and the pixel area 921 is necessarily greater than or equal to the third distance K3 in the vertical direction.

As can be seen from the above, due to the presence of the first distance K1, the second distance K2, and the third distance K3, the backlight 830 must be located directly below the pixel region 821. In this embodiment, the backlight 830 can be in a proper position by adjusting the sizes of the first distance K1, the second distance K2, and the third distance K3, thereby improving the sharpness of the fingerprint image formed by the optical fingerprint sensor module.

As shown in FIG. 13 , in the embodiment, the optical fingerprint sensor 920 and the backlight 930 further include a transparent medium layer 940 . The light emitted by the backlight 930 first enters the transparent medium layer 940 and then enters the optical fingerprint sensor 920 . In this embodiment, the refractive index of the transparent dielectric layer 940 can be further selected to be 1.2 or more, thereby further improving the performance of the optical fingerprint sensor module. The material of the transparent medium layer 940 may specifically be a glass layer, a plastic layer or an optical glue layer. In this embodiment, the lower surface of the transparent medium layer 940 is a condensing surface (not labeled in FIG. 13 ), and the light emitted by the backlight 930 enters the transparent medium layer 940 from the condensing surface, and the concentrating light The surface converts the light emitted by the backlight 930 into parallel light or near-parallel light.

Different from the foregoing embodiment, the concentrating surface of the transparent medium layer 940 (specifically on the lower surface) further has a light anti-reflecting layer 950, which can increase the light of the backlight 930 into the transparent medium layer. The ratio, therefore, when fingerprint image acquisition is performed, more light can be used for fingerprint image acquisition, resulting in higher definition and accuracy. The fingerprint image further enhances the performance of the optical fingerprint sensor module.

Although the present invention has been disclosed above, the present invention is not limited thereto. Any changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be determined by the scope defined by the appended claims.

Claims

An optical fingerprint sensor module includes:

An optical fingerprint sensor having a light transmissive substrate and a device layer on a surface of the light transmissive substrate; the device layer having a pixel region, the pixel region having a plurality of pixels, each of the pixels having a light transmission a region and a non-transmissive region, the non-transmissive region having a photosensitive element, the light transmissive region enabling light to pass through the pixel region of the device layer;

a protective layer, the protective layer being located above the entire optical fingerprint sensor;

Backlight;

The backlight is located directly under the pixel area, and there is a space between the backlight and the optical fingerprint sensor, and the light emitted by the backlight and the upper surface of the protective layer are sandwiched. The angle is mainly at right angles or close to right angles.
The optical fingerprint sensor module of claim 1 , wherein the optical fingerprint sensor and the protective layer have a first optical adhesive layer, and the light emitted by the backlight passes through the transparent substrate. And then passing through the device layer from the light transmissive region, entering the first optical adhesive layer, and entering the protective layer from the first optical adhesive layer.
The optical fingerprint sensor module of claim 1 , wherein the optical fingerprint sensor and the protective layer have a first optical adhesive layer, and the light emitted by the backlight passes through the transparent region. Pass through the device layer and then through the The transparent substrate is further introduced into the first optical adhesive layer, and then enters the protective layer from the first optical adhesive layer.
The optical fingerprint sensor module according to any one of claims 1 to 3, wherein the backlight comprises at least one LED lamp, and the light of the LED lamp is near ultraviolet light, purple light, blue light, green light. Light, yellow, red, near-infrared, or white.
The optical fingerprint sensor module according to any one of claims 1 to 3, wherein the backlight comprises two or more LED lamps, and the two or more LED lamps are symmetrically distributed Directly below the optical fingerprint sensor, the light of the LED lamp is near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light.
The optical fingerprint sensor module according to any one of claims 1 to 3, wherein the light emitting surface of the LED lamp has a collecting lens on the front side thereof, and the collecting lens can convert the light of the LED lamp into Parallel light or near-parallel light, the light of the backlight first enters the collecting lens and then enters the optical fingerprint sensor.
The optical fingerprint sensor module according to any one of claims 1 to 3, wherein the surface of the optical fingerprint sensor adjacent to the backlight further comprises a light antireflection layer, and the light antireflection layer can increase the The proportion of light from the backlight entering the optical fingerprint sensor.
The optical fingerprint sensor module according to any one of claims 1 to 3, wherein The optical fingerprint sensor and the backlight further comprise a transparent medium layer, and the light emitted by the backlight first enters the transparent medium layer and then enters the optical fingerprint sensor.
The optical fingerprint sensor module according to claim 8, wherein a lower surface of the transparent dielectric layer is used as a condensing surface, and light emitted by the backlight enters the light transmission from the condensing surface. a dielectric layer that converts light emitted by the backlight into parallel light or near-parallel light.
The optical fingerprint sensor module according to claim 9, wherein a second optical adhesive layer is disposed between the optical fingerprint sensor and the transparent medium layer, and light emitted by the backlight is transmitted from the light. The dielectric layer first enters the second optical adhesive layer, and then enters the optical fingerprint sensor from the second optical adhesive layer.
The optical fingerprint sensor module according to claim 10, wherein said lower surface of said transparent dielectric layer further has a light antireflection layer, said light antireflection layer capable of increasing light of said backlight The ratio of entering the transparent medium layer.
The optical fingerprint sensor module according to claim 9, wherein the transparent medium layer is a glass layer, a plastic layer or an optical glue layer.
The optical fingerprint sensor module according to claim 12, wherein the transparent medium layer has a refractive index of 1.2 or more.
The optical fingerprint sensor module according to claim 9, wherein the concentrating surface of the transparent dielectric layer is a bevel, a spherical surface, an ellipsoidal crown, and a cone Side or pyramid side.
The optical fingerprint sensor module according to any one of claims 1 to 3, wherein the protective layer is a single layer or a multilayer structure, an upper surface, a lower surface of the protective layer, and the optical fingerprint sensor At least one of the upper surfaces has a filter layer.
The optical fingerprint sensor module according to any one of claims 1 to 3, wherein the device layer region further has a plurality of scanning lines arranged in a first axial direction and a plurality of scanning lines arranged in a second axial direction. A data line, the scan line and the data line defining a plurality of grids, the pixels being located in the grid.
The optical fingerprint sensor module according to claim 2 or 3, wherein the first optical adhesive layer is a thermosensitive optical adhesive layer, a photosensitive optical adhesive layer or an optical double-sided adhesive tape.
The optical fingerprint sensor module according to claim 10, wherein the second optical adhesive layer is a thermal optical adhesive layer, a photosensitive optical adhesive layer or an optical double-sided adhesive tape.